      MODULE INMSOIL_PHYSCONSTS
!      
! COMMON
!
      REAL, PARAMETER ::
     :	grav = 9.81,		      ! acceleration due to gravity (m/s**2)
     :	PL = 600.,				  ! latent heat for evapor./condens. (cal/g)	
     :	PLI = 80.                 ! latent heat for freezing/melting (cal/g)
!
! AIR
!
      REAL, PARAMETER ::
     :	CPA = 0.24,               ! air specific heat content (cal /(g deg))
     :	SIGMASB = 0.135435E-7,    ! Stephan-Boltzman sigma(cal/(m**2 sec K**4))
     :	APPA = 0.286,			  ! kappa = c_v/c_p
     :	R = 287.,				  ! universal gas constant
     :	CP = 1004.
!
! SOIL and SNOW
!
      REAL, PARAMETER ::
     :	RHOW = 1.,               ! the liquid water density, gr/cm**3
     :	RHOI = 0.9168,           ! the ice density, gr/cm**3
     :	CR = 0.24,!cal/(cm**3 K) ! the soil specific heat content, cal/(gr K)
     :	CWAT = 1.,               ! the water specific heat content, cal/(gr K)
     :	CICE = 0.5,              ! the ice specific heat content, cal/(gr K)
     :	CSNOW = 0.5,             ! the snow specific heat content, cal/(gr K)
     :	WMG = 0.04,
     :	alpha_snow = 6.0,        ! constant for calculation of maximum canopy load for snow, kg/m2
     :	c_t_unload = 1.87E05,    ! constant for calculation of snow unloading rate from canopy due to air temperature, dimensionless
     :	c_u_unload = 1.56E05     ! constant for calculation of snow unloading rate from canopy due to wind, dimensionless
!		
! HYDROLOGY
!
      REAL, PARAMETER ::
     :	WLMMX = 5.E-2,           ! CM. OF WATER. MINIMAL SKIN LAYER CAPACITY
     :	CEFF = 0.5,              ! 1 FRACTION OF INTERCEPTED BY SKIN LAYER PRECIP.
     :	CA = 1.,                 ! 1 FRACTION OF THE CELL, COVERED BY PRECIP.
     :	DZL = 100.,              ! M. MINIMAL ST. DEV. OF TOPOGR. FOR RUNOFF CALC.
     :	DZG = 1000.,             ! M. MAXIMAL ST. DEV. OF TOPOGR. FOR RUNOFF CALC.
     :  WSDL = 0.05,             ! 1 SOIL WETNESS FROM WHICH DRAINAGE BEGIN
     :  WSDG = 0.9,      	     ! 1 SOIL WETNESS FROM WHICH FAST DRAINAGE BEGIN	
     :	BMIN = 0.01,             ! 1 MINIMAL B FOR RUNOFF CALC.
     :	DMIN = 2.8E-8,           ! CM/S. COEFF. FOR SLOW DRAINAGE
     :	DMAX = 2.8E-6,           ! CM/S. COEFF. FOR FAST DRAINAGE
     :	D = 1.5,                 ! 1 COEFF. FOR FAST DRAINAGE
     :	WIINF = 0.30,            ! 1 SOIL ICE, FROM WHICH INFILTRATION BEGIN
     :	ZRM = 10.0,              ! CM. LAYER OF SOIL WITH LARGE AMOUNT OF ROOTS
     :	ZRMM = 20.,              ! CM. LAYER OF SOIL FOR CALCULATION OF LAI AND VEG
     :	TRM = 5.0,               ! C. CRITICAL SOIL TEMPERATURE FOR LAI AND VEG
     :	TOMIN = 0.1,             ! C. CRITICAL TEMPERATURE FOR WATER ACCESS FOR CANOPY
     :	FLXMIN = 1.0, !0.25,           ! CAL/(M**2*S) ACCURACY OF BALANCE AT THE SURFACE
     :	CK = 0.9                 ! 1 COEFF. FOR CANOPY RESIST.
     
      END     
